Door-motor.



'Patented-July 13, 1915.

2 SHEETS-SHEET J. F. VICELROY, DECD.

s. H. McELRoY. ExEcuTRlx.

DOOR MOTOR. APPLICATION r|LEo1uN1.19||.

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l. F. MCELROY, DECD.

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DOOR MOTOR.

APPLICATION mso lumi l. 191|.

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Patented July 13, 1915.

2 SHEETS-SHEET 2 es arten rrr.

JAMES F. MQIELRY, 0F ALBANY, NEW YORK; SUSIE HALE MCELROY, EXECUTRIX 0FSAU) JAMES l5". MCEOY, DECEASED, ASSIGNOR TO CONSOLIDATED CAR-HEATINGCMPAY, A. GRPORATXGN GF WEST VIRGINIA.

BOOR-MOTOR.

Application flied June l, 1911.

To all whom it may concern:

lBe it known that l, JAMES F. MCELROY, a citizen of the United States,residing at Albany, county of Albany, State of New York, have inventedcertain new and useful lmprovements in Door-Motors, the following beinga full, clear, and exact disclosure of the one form of my inventionwhich l at present deem preferable.

-F or a detailed description of the present form of my invention,reference may be had to the following specification and to theaccompanying drawings, which illustrate my invention. l

Figure 1 is a plan view and Fig. 2 a side elevation of my improved doormotor; Fig. 3 is a plan of the same, together with the piping, and Fig.i is a side elevation of Fig. 3..

My present invention involves certain improvements in door motors basedupon and constituting a development of my tour-cylinder form of motorand relates particularly to the mode of supporting such a motor andrelating it to a car door to be operated thereby.

rllurning to Fig. l, A1 and A2 are two open-ended cylinders, facing eachother but upon different levels, as more clearly appears in Fig. 2. B2and B2 are similar cylinders arrangedjparallel to and at one side of thecylinders Alf and A2 respectively. rThe latter are power cylinders,while B1 and"B2 are cushioning or dash-pot cylinders, corre,- spondingrespectively to` A1 and A2. A cross-headD, connected to the piston rodsat' and b2 of the respective cylinders A1 and B2, travels on the set ofcylinders A2 and B2, while a similar cross-head D2, connected to thepiston rods a2, travels on the cylinders- A1 and B2. The two cross-headsDl and D2 are connected by a rod C,`so that the four piston rods and thetwo cross-heads all move together. rll`he cylinder B1 acts as acushioning cylinder or dash-pot for the power cylinder A1, and,similarly, the cylinder B2 serves as a cushioning cylinder or dash-potfor the power cylinder A2. rl`h'us if air is admitted to the right-handclosed end of the cylinder A1 through the pipe l, its piston rod a1 willbe forced to the left and at the same time the piston in cylinder Blwill also move from the right-hand, open closed end of that cylindertoward the letthand end and tend Specification of Letters Patent.

Patented duly t3, with.

serial No. 630,680.

to compress the air therein, which escapes, however, through arestricted outlet. Conversely, if the air is admitted to the lefthandVclosed end of cylinder A2 by the pipe 3, its piston rod a2 will move tothe right and the piston of B2 will similarly move to the right andprovide the cushioning or damping eflect upon the action of the cylinderA2. 0n the cross-head D1 are two ears d d which, as appears in Figs. 3and 4l, are connected to a movable element R through link d1 and theotl'set link R4. The above-mentioned cylinders are supported as clearlyappears in Fig. 2. 'lhe standard S2 at the left supports the left-handends of cylinders A2 B1 and also carries the lock hereinafter described.rlhe central standard S2 carries the inner free ders, which arepreferably oi. brass, are notV screw threaded at the point where theyenter the head of the standard S2, but are merely inserted in openingsin the standard and are secured therein by screws 81 s2. These screws s1s2 pass through the wall of the standard S2 and the cylinders, so thatafter the cylinders are inserted in the standard andthe screws are inplace they cannot be withdrawn. By merely removing the screws, however,the cylinders are left free to be withdrawn from their position in thestandard. Since the end standards S1 and S2 are separate from thecentral one S2, these end standards, together with the cylinders secured thereto, can thus be easily drawn away from the central Standard.The open ends of the several cylinders are flared or beveled, as clearlyappears in dotted lines in Figs. l and 2. The piston rods are connectedto their respective cross-heads D1 and D2 by means of sockets formed inthe cross-heads, into which sockets the rods enter and abut against thebottoms thereof. Cotter pins Z2 are then passed through the rods andthrough the projecting flanges around the edges of the sockets. Thesecotter pins are not essential, since the pressure of the pistons acts inevery case to push the piston rod into its socket` but they are presentas a matter of precaution. This arrangement etl renders it very easy toremove a piston and piston rod, since it only involves the withdrawingof the cotter pin-and the moving aside of the cross-head, assuming thatthe cross-head is iirst disconnected from the rod C, which joins the twocross-heads together' and is connected thereto in a similar way.

In these figures G represents an air reservoir from which the air passesby pipe 2, Iirst through a strainer g1, then through a stop cock y tothe inlet side of the controlling valve F, which it is not necessary todescribe in detail, it being well understood that such a valve will actto admit the air to either the c vlinder A1 by means of the pipe l, orto the cylinder A2 by means of the pipe 3. 'ln the former case it willalso connect the pipe 3 to the exhaust, while in the latter case it willalso connect pipe l to the exhaust,`so that when air is admitted to theworking end of one cylinder the working end ot' the opposite cylinder isconnected to the exhaust. The exhaust pipe is shown at As stated above`the motor operates the movable element R here shown as a door (see Figs.3 and 4) by links Z1 and R4 and the door slides just inside the wall Vof the car, being guided by the friction rollers 'r-r and arrested bythe stop column V1. My motor being of a long, narrow form can be placedunder the car seat at one side of the route of travel of the door andits stroke can be equal in length to the travel of the door from open toclosed position. Hence the cross-head D1 can be connected directly tothe door by links all, R4 which renders the installation extremelysimple and compact,

without the complication of devices for multiplying the range of strokeof the motor to give an adequate range of travel of the door. The smalldiameter 0f cylinder will give the force required to move the door andalso will occupy but little space transversely ot' the car. Theadvantage of this is that the motor has a uniform leverage connectionwith the door at all points of the travel of the door, whereas theinterposition of levers between the piston and door gives the piston agreater leverage as the door'approaches its closing position so that anarm, hand or leg caught in the door at that time may be crushed by thegreat force which the piston can exert through the leverage it has atthat point. By applying the piston directly to the door, as in myarrangement, it becomes easy to adjust its force, so that it can closethe door without having sufficient power to crush or injure a person whomay be caught between the door and the jamb. Such adjusted force becomesalso no greater at the door when the door is at either end of its routethan at the middle. My arrangement is one producing such a uniformmechanical advantage of the motor upon the door, each motor cylinder,for this purpose, being given a stroke substantially equal to the lengthof the route traversed by the door and both cylinders being placed asnearly aspossible in line with each other, the door-opening cylinderalong and beside the route traveled over by the door in opening, and thedoorclosing cylinder beyond the said route but in the Same general linetherewith. Moreover, the piston rod o1 the door-closing cylinderoverlaps and is guided b v the door-opening cvlinder` the thrust andbuckling strain on the long rod of the remote door-closing cylinderbeing thereby taken up, and only the short door link fl interposedbetween the door and the point of push or thrust on the motor which isthe cross-head D1. Likewise the door-opening cylinder has its closed endplaced toward the door or adjacent to its rear edge and the thrust onits long piston rod, which overlaps and is guided by the door-closingcylinder, is transmitted back by the rod C to the cross-head Dl which isthe point on the motor whence force is applied to the door through theshort link d. In both cases the arrangement of the motor with respect tothe door is such that only a short and direct connection between them isrequired, although the motor stroke is very long and the thrust-strainon the piston rods would otherwise tend to buckle them. Also the end ofeach piston rod is guided externally of the cylinder although the motoris applied to the lower part of the door where no piston guide extendingacross the closed position of the door or along the route of travel ofits forward edge would be permissible.

What I claim as new and desire to secure by Letters Patent is:

1. The combination with a movable element, of a motor cylinder, saidcylinder being located along the route traveled by the movable elementand having a stroke substantially equal to the travel of the movableelement, a piston' movable in said cylinder and provided with a pistonrod, a guide eX- ternal of the cylinder and movable thereon, said guidebeing connected to said piston rod, and a direct connection between saidpiston rod and the movable element.

2. The combination with a movable element, of a motor cylinder, saidcylinder being located to one side of the route traveled by the movableelement and having a stroke substantially equal to the travel of themovable element whereby the movable element and cylinder overlap at oneextremity of the travel of said piston, a iston movable in said-cylinderand provi ed with a piston rod,r an external cross head guided by saidcylinder and connected to said piston rod, and a direct connectionbetween said crosshead and said movable element.

3. The combination with a movable element, of a motor cylinder, saidcylinder belli aaaaaoe ing located along the route traveled by themovable element and having a stroke substantially equal to the travel ofthe movable element, the closed end of said cylinder being locatedadjacent the rear edge of said movable element when the latter is inclosed position, a piston movable in said cylinder and provided with alpiston rod, a piston guide extending beyond said cylinder, a cross-headguided by said cylinder and connected with said piston rod, and a directconnection between said cross head and said movable element. 4

4. 'llhe combinatin with a movable element, of a motor cylinder having astroke substantially equal to the travel of said movable element andlocated to one side of the route traveled bv the rear edge of the latterwith its closed end adjacent to said edge, a second cylinder extendingbeyond the one first named, a cross-head guided bythe rst cylinder andtraveling the length of the same, and a connection between saidcrosshead and the respective pistons of both cylinders.

5. rl`he combination with a movable element, of a cylinder for movingthe same in one direction and having a stroke substantially equal to thetravel ot the rear edge ot the said movable element and located to oneside of the route of ttavel ol the said rear edge, a cylinder tor movingsaid movable element in the opposite direction and located between thefirst mentioned cylinder and the movable element but odset with respectthereto, an external cross-head guided by one of said cylinders, aconnection between said cross-head and movable element, and a connectionbetween said cross-head and the respective pistons of both cylinders.

6.' 'lhe combination with a movable element,.ot cylinders tor shiftinthe same in opposite direction and locate in succession to one side ofthe route of the movable element in one of its'extreme positions butodset with respect to each other, a piston and piston rod for eachcylinder, a traveling cross-head guided by one cylinder, a connec tiontrom said cross head-to the movable element, a traveling cross-*headguided by the other cylinder, a connectionl between said cross head, arod connecting the rst mentioned cross head with the piston of the lastmentioned cylinder, and a rod connecting the last mentioned cross-headwith the piston of the other cylinder.

7. An apparatus ot the character described comprising a reciprocatingelement to be operated, two power cylinders in tacing relation but indid'erent planes one ot which cylinders overlaps the line of travel ofthe said element, pistons and piston rods for the respective cylinders,and odset connecting means for operating the said reciprocating element.y

8. An apparatus of the character described comprising a reciprocatingelement to be operated, two power cylinders in tacing relation but indiderent planes one et which overlaps the line ot travel of saidelement, pistons and piston rods for the respective cylinders having arange ot travel equal to the range ot travel ot said element, and

odset connecting means for operating the said element.

lin witness whereof ll have hereunto set my hand, before two subscribingwitnesses,.

this 29th dav of ll/lay, 1911.

JAMES l?. MGELRUY. Witnesses:

HERBERT A. Calas, @mannen Pannen.

